I get the following very weird result:

sage: A=axiom.series(z,z=0)
sage: A

sage: A
z
sage: B = (1/(1-A^2))
sage: B

       2    4    6    8    10      11
  1 + z  + z  + z  + z  + z   + O(z  )
sage: A

       2    4    6    8    10      11
  1 + z  + z  + z  + z  + z   + O(z  )
sage: A
z
sage: B
z

Since this does not happen in FriCAS itself, I wonder what the reason could be?

Many thanks,

Martin


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